<?php
# Helper methods for the RAWS interface classes.
#
# Copyright (C) 2008 rambla.be
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

function safe_raws_uri($base_uri, $resource, $path = null) {
  if (! $base_uri) {
    require_once 'Zend/Gdata/App/InvalidArgumentException.php';
    throw new Zend_Gdata_App_InvalidArgumentException(
            'Base URI was not specified');
  }
  if (! $resource) {
    require_once 'Zend/Gdata/App/InvalidArgumentException.php';
    throw new Zend_Gdata_App_InvalidArgumentException(
            'Resource was not specified');
  }
  # trim all slashes
  $base_uri = rtrim($base_uri, '/');
  $resource = rtrim($resource, '/');
  $resource = ltrim($resource, '/');
  $path = trim($path, '/');
  # add parts
  $uri = $base_uri . "/" . $resource . "/";
  if (strlen($path)) {
    $uri .= $path . "/";
  }
  return $uri;
}
